<template>
   <div class="app-container">
   <h2 style="text-align: center;">发布新课程</h2>
   <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
   </el-steps>
   <el-button type="button" @click="dialogChapterFormVisible=true">添加章节</el-button>
<!-- 章节 -->
<ul class="chanpterList">
 <li v-for="chapter in chapters" :key="chapter.id">
 <p>{{ chapter.title }}
  <span class="acts">
      <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
      <el-button style="" type="button" @click="openEditChatper(chapter.id)">编辑</el-button>
      <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
      </span>
 </p>
 <!-- 视频 -->
 <ul class="chanpterList videoList">
 <li v-for="video in chapter.children" :key="video.id">
 <p>{{ video.title }}
 <span class="acts">                  
   <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
   <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
 </span>
 </p>
 </li>
 </ul>
 </li>
</ul>
   <el-form label-width="120px">
       <el-form-item>
          <el-button @click="previous">上一步</el-button>
          <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
       </el-form-item>
    </el-form>
    <!-- 添加和修改章节表单 -->
<el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
<el-form :model="oneChapter" label-width="120px">
<el-form-item label="章节标题">
<el-input v-model="oneChapter.title"/>
</el-form-item>
<el-form-item label="章节排序">
<el-input-number v-model="oneChapter.sort" :min="0" controls-position="right"/>
</el-form-item>
</el-form>
<div slot="footer" class="dialog-footer">
<el-button @click="dialogChapterFormVisible = false">取 消</el-button>
<el-button type="primary" @click="saveOrUpdate">确 定</el-button>
</div>
</el-dialog>

<!--小节弹框 -->
<!-- 添加和修改课时表单 -->
<el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
<el-form :model="video" label-width="120px">
<el-form-item label="课时标题">
<el-input v-model="video.title"/>
</el-form-item>
<el-form-item label="课时排序">
<el-input-number v-model="video.sort" :min="0" controls-position="right"/>
</el-form-item>
<el-form-item label="是否免费">
<el-radio-group v-model="video.isFree">
<el-radio :label="1">免费</el-radio>
<el-radio :label="0">收费</el-radio>
</el-radio-group>
</el-form-item>
<el-form-item label="上传视频">
<el-upload
:on-success="handleVodUploadSuccess"
:on-remove="handleVodRemove"
:before-remove="beforeVodRemove"
:on-exceed="handleUploadExceed"
:file-list="fileList"
:action="BASE_API+'/eduvod/video/uploadaliyunVideo'"
:limit="1"
class="upload-demo">
<el-button size="small" type="primary">上传视频</el-button>
<el-tooltip placement="right-end">
<div slot="content">最大支持1G,<br>
 支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
 GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
 MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
 SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
<i class="el-icon-question"/>
</el-tooltip>
</el-upload>
</el-form-item>
</el-form>
<div slot="footer" class="dialog-footer">
<el-button @click="dialogVideoFormVisible = false">取 消</el-button>
<el-button :disabled="saveVideoBtnDisabled" type="primary"
@click="saveOrUpdateVideo">确 定</el-button>
</div>
</el-dialog>
   </div>
</template>
<script>
import chapterAPI from '@/api/edu/chapter'
import videoAPI from '@/api/edu/video' 
import vod from '@/api/edu/vod'
export default {
    data() {
      return {
        dialogChapterFormVisible: false, //是否显示章节表单
        dialogVideoFormVisible: false,
        saveBtnDisabled: false, // 保存按钮是否禁用
        saveVideoBtnDisabled: false,
        courseId: '',
        chapters: [],
        oneChapter:{
           title: '',
           sort: 0
        },
        video: {// 课时对象
          title: '',
          sort: 0,
          isFree: 2,
          videoSourceId: '',
          videoOriginalName: ''
        },
        fileList: [],//上传文件列表
        BASE_API: process.env.BASE_API // 接口API地址
      }
    },
created() {
    if(this.$route.params&&this.$route.params.id){
        this.courseId=this.$route.params.id;
        this.getChapterVideo();
    }

},
methods: {
   handleVodUploadSuccess(response,file,fileList){
       this.video.videoSourceId=response.data.videoId;
       this.video.videoOriginalName=file.name;
   },
   //视图上传多于一个视频
   handleUploadExceed(files, fileList) {
   this.$message.warning('想要重新上传视频，请先删除已上传的视频')
   },
   beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除 ${file.name}?`)
   },
   handleVodRemove(){
     vod.deleteVideoById(this.video.videoSourceId)
     .then(response=>{
          this.$message({
            type: 'success',
            message: '删除视频成功！'
          })
          this.fileList=[]
          this.video.videoSourceId=''
          this.video.videoOriginalName=''
     })
     .catch(err=>{
      this.$message({
         type: 'error',
         message: '删除视频失败！'
      })
     })
   },
    previous() {
       this.$router.push({ path: '/course/info/'+this.courseId})
    },
    next() {
       this.$router.push({ path: '/course/publish/'+this.courseId})
    },
    saveOrUpdateVideo(){
      this.saveVideoBtnDisabled=true;
       if(!this.video.id){
          this.addVideo(this.video)
       }else{
         this.modifyVideo(this.video)
       }
        this.fileList=[]
    },
    removeVideo(videoId){
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).then(() => {
       videoAPI.deleteVideo(videoId)
       .then(response=>{
         this.$message({
            type: 'success',
            message: '删除小节成功！'
         })
         this.getChapterVideo()
       })         
      })     
    },
    openVideo(chapterId){
        this.dialogVideoFormVisible=true;
        this.video.chapterId=chapterId;
        this.video.courseId=this.courseId;
        this.video.title='';
        this.video.sort=0;
        this.videoSourceId='';
        this.video.isFree=2;
    },
    addVideo(){
       videoAPI.addVideo(this.video)
       .then(response=>{
         this.getChapterVideo()
         this.helpVideoSave()
       })
       .catch(err=>{
            this.$message({
                type: 'err',
                message: '添加小节失败！'
            })
       })
    },
    modifyVideo(){
       videoAPI.modifyVideo(this.video)
       .then(response=>{
         this.getChapterVideo()
         this.helpVideoSave()
       })
       .catch(err=>{
            this.$message({
                type: 'err',
                message: '更新小节失败！'
            })
       })
    },
    openEditVideo(videoId){
       this.dialogVideoFormVisible=true;
        videoAPI.getVideoInfo(videoId)
        .then(response=>{
          this.video=response.data.item;
          if(this.video.videoOriginalName!==null&&this.video.videoOriginalName!==''){
             this.fileList=[{'name':this.video.videoOriginalName}]
          } 
        })
        .catch(err=>{
           this.$message({
                type: 'err',
                message: '拉取小节信息失败！'
            })
        })
    },
    helpVideoSave(){
      this.dialogVideoFormVisible=false;
      this.getChapterVideo();
      this.video.title='';
      this.video.sort=0;
      this.video.free=0,
      this.videoSourceId='';
      this.saveVideoBtnDisabled=false;
    },
   openEditChatper(chapterId){
      this.dialogChapterFormVisible = true
      chapterAPI.getChapterById(chapterId)
      .then(response=>{
         this.oneChapter=response.data.item;
      })
      .catch(err=>{
          this.$message({
                type: 'err',
                message: '获取信息失败！'
            })
      })
    },
    removeChapter(chapterId){
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).then(() => {
      chapterAPI.deleteChapterById(chapterId)
      .then(response=>{
        this.getChapterVideo()
      })
      .catch(err=>{
         this.$message({
             type: 'err',
             message: '删除章节失败！'
         })
      })    
      })        
    },
    helpSave(){
      this.dialogChapterFormVisible = false// 如果保存成功则关闭对话框
       this.getChapterVideo()// 刷新列表
      this.oneChapter.title = ''// 重置章节标题
      this.oneChapter.sort = 0// 重置章节标题
      this.saveBtnDisabled = false
    },
    getChapterVideo(){
        chapterAPI.getChapters(this.courseId)
        .then(response=>{
           this.chapters=response.data.list;
        })
        .catch(err=>{
            this.$message({
                type: 'err',
                message: '获取信息失败！'
            })
        })
    },
    saveOrUpdate(){
     this.saveBtnDisabled = true
      if (!this.oneChapter.id) {
        this.addChapter()
      } else {
      this.updateChapter()
      }
    },
    updateChapter(){
      chapterAPI.updateChapter(this.oneChapter)
      .then(response=>{
         this.helpSave();
      })
      .catch(err=>{
         this.$message({
            type: 'err',
            message: '更改信息失败！'
         })
      })
    },
    addChapter(){     
      chapterAPI.addChapter(this.oneChapter,this.courseId)
      .then(response=>{
         this.$message({
            type: 'success',
            message: '添加章节成功！'
         })
         this.helpSave()

      })
      .catch(err=>{
           this.$message({
                type: 'err',
                message: '添加章节失败！'
            })
      })
    }
 }
}
</script>
<style scoped>
.chanpterList{
 position: relative;
 list-style: none;
 margin: 0;
 padding: 0;
}
.chanpterList li{
    position: relative;
}
.chanpterList p{
 font-size: 20px;
 margin: 10px 0;
 padding: 10px;
 height: 70px;
 line-height: 50px;
 width: 100%;
 border: 1px solid #DDD;
}
.chanpterList .acts {
 float: right;
 font-size: 14px;
}
.videoList{
 padding-left: 50px;
}
.videoList p{
 font-size: 14px;
 margin: 10px 0;
 padding: 10px;
 height: 50px;
 line-height: 30px;
 width: 100%;
 border: 1px dotted #DDD;
}
</style>